I'm getting a build conflict between eselect-boost and the split boost builds available through your overlay. It seems to also be that the standard version of boost has overtaken your version... I thought maybe someone else would have run into this, but I haven't been able to find any reference in the forums or searching elsewhere.
Thank you,
James

eclass/alternatives: import from gentoo repo: allow directories to be symlinked
eclass/boost-headers: SLOT; make use of alternatives; *happy user experience*
eclass/boost: INFO: may need to be tweaked for that change: switch alternatives